Răspuns :
5x - (-7) = -48
5x + 7 = - 48
5x = -48 - 7
5x = -55
x = -55/5
x = -11
5x + 7 = - 48
5x = -48 - 7
5x = -55
x = -55/5
x = -11
5x-[12-19]=-48
⇒5x-[-7]=-48
⇒5x+7=-48
⇒5x=[-48]-7
⇒5x=-55
⇒x=[-55]/5
⇒x=-11;
⇒5x-[-7]=-48
⇒5x+7=-48
⇒5x=[-48]-7
⇒5x=-55
⇒x=[-55]/5
⇒x=-11;